Fluid-pressure brake



Jan. 20, 1931. 1-. H. THOMAS FLUID PRESSURE BRAKE Filed Aug. '7, 1929 DISTRIBUTING VALVE RELEASE PIPE A PPL ICA Tl 0N c y; M/DER/ PIPE ' m vlzm'da "THOMAS H.THoMAs(oEc o) MABLEMIHOMAS,EXEQUTRIX ATTOR 'E'Y Patented Jan. 20, 1931 outrun STATES .PAT'EN T oFI-Ica moms x. moans, nncna'snn, LATE or nnonwoon-rmmsnvmu, 32 mu 11.

moms, .Exneu'rmx, or nnonwoon, rmmsnvmra, assmnon 'ro rm: WEST- menousn am BRAKE comm, or wnmnnnmo, rms nvmrya commanrron or rmmsnvanu nurn-rmsunn mun:

Application m August i', 1929. Serial 10 885015.

This invention relates to fluid pressure brakes, and more particularly to a locomotivebrake equipment.

The well known E. T. locomotive brake 5 equipment comprises a distributing valve device having an equalizin portion and an] application portion and w en the equahz-,

ing portion is operated upon a reduction in brake pipe pressure, fluid under pressure is supplied to an application chamber and to the application cylinder of the application portion, so thatthe application portion is operated to supply fluid under pressure to the locomotive brake cylinders.

An automatic brake valve device and an independent brake valve device are provided and in running position, the application chamber is connected to the atmosphere by way of the distributing valve release pipe,

' through ports controlled by the equalizing ortion and through ports in the independent rake valve and the automatic brake valve.

It is sometimes the case that the slide valve of the equalizing portion will move from release position toward application position when it is not intended to efiect an ap 'lication of the brakes, such as where the h pipe is overcharged in the release position of the automatic brake valve and'then when the 3 brake valve is" moved to runningposition, the pressure chamber of the equa izmg portion of the distributingvalve device having been overcharged from the brake pipe, the equalizing piston may shift the equalizing slide valve from release positiontoward application position far enough to blank the distributing valve release pipe connection to the application chamber, and then leakage'past the slide valve of the equalizing portion to the application chamber may be suflicient to cause the application portion to operate to apply the brakes. The movement of the automatic brake valve from release position to running position connects the distributing valve release pipe to the atmosphere, but fluid is not released under the above conditionsfrom the application chamber, since the movement of the equalizing, slide valve from release position toward application position has cut ofi rake 0 communication from the application chamber to "the distributing valve release pipe.

- The principal object of the invention is to provide means for reventing an undesired application of the brakes under the above circumstances. 7

For accomplishing this purpose of the invention, there is provided a pipe connection direct from the application chamber of the distributin valve device, which is opento the atmosphere only when the independent brake valve and the automatic brake valve are in running position, this directpipe connection being connected to 'the"'atmo here through the usual doubleheadin coc except when the cookie in its doub e heading position.

In view of the fact that the E. T. locomotive brake equipment is well known and extensively used in railway brake service, it is not deemed necessary to a clear. understanding of the invention to show and describe I such an equipment in its entirety, and consequently only so much of shown and described as seems necessary to fully1 explain the construction and operation I t e improvement. 4

In the accompanying drawing, Figure 1 is the equipment is a diagrammatic view, partly in section, of a portion of an E. T. locomotive brake equipment,,showing theinvention embodied therein; and Fi 2 a transverse section of the double hea ing cock. T

In the drawing, the reference numeral 1 indicates a portion'of a distributing valve device comprising an equalizing portion and an application portion. The equahzing portion comprises a slide valve 2 contained in valve chamber 3 and ada(pted tobe operated by an equalizing piston notshown). The application po rtion comprises a piston 4 contained in app 'cation 0 finder 5 and said piston is operated-by flui under pressure suppliedfto t e cylinder 5 for operating a valve (not shown for sulppl in fluid under pressure tothe rake cy in or not shown).

In the release position of slide valve'2 as shown in the drawing, the application cy 'nder' 5 is connected throu h g apassag'e (Spade cavity in'the slide valve with passage 8} port'31. In the double heading position 0 v with passage 1 comprises a casing containing a rotary valve 14 adapted to be operated b a handle 15 and the automatic brake valve evice 16 includes a rotary valve 17 adapted to be operated by a handle 18.

A double heading cook 19 is disposed in the usual brake pipe 20 and has a plug valve-21 adapted to be operated by a handle 22.

Accordin to the invention, a pipe 23 is connected directly to the application chamber 9 and said pipe is connected in the running position only of the independent brake valve 13,-through a cavity 24 in the rotary valve 14 with a pipe 25 which communicates with a passage 26 in the automatic brake valve'device 16, leading to the seat of the rotary valve 17. v

In the running positiononly of the automatic brake valve, the passage 26 is connected through a cavity 27 in the rotary valve 17 with a pipe 28. In the normal position 0 the plug valve 21 of the double heading cock, communication through the brake pipe 20 is established by way of port 29 and in this position, as shown in Flg. 2, pipe 28 is connected to an atmospheric port 30 through the cock, communication through the brake pipe is cut ofi and the pipe 28 is also cut of! from the atmosphere.

I sition,

With the tvvobrake valves in running poas' shown in the drawing, and with the double heading cock in normal position, the application chamber 9 is connected to the atmosphere as above described and if the equalizin slide valve 2 should move from release posltion toward application position, while communication from the application cylinder to the distributing valve release pipe 12 would be cut off, communication will be established from passage 6, through cavity 32 in the slide valve 2, with passage 8, so that the application chamber 9 is connected to .the application cylinder 5. If fluid under ressure should now leak past the slide va ve 2 into the application chamber 9, such fluid Wlll be vented through pipe 23, cavity 24 in the rotary valve 14, cav1ty2 7 in the rotary valve 17, pipe 28, and throu h port 31 in the double heading cock 19, to t e atmosphere, by way of the port 30.-

Fluid,pressure cannot therefore be built up in the application chamber 9 and in the a lication cylinder 5, by leakage pastthe slide valve 2, and consequently the brakes will not be applied under the above conditions.

In double heading, the cock 21 is turnedpn the second engine to the position in wh c connected to f tion of the brakes, a

communication through the brake pipe to the brake valve on the second engine is cut off. In this position, communication is also cut oil from the pipe 28 to the atmosphere.

While one illustrative embodiment of the invention has been described in detail, it is not the intention to limit its scope to that embodiment or otherwise than by the terms a of the appended claims.

Having now described the invention, what is claimed as new and desired to' secure by Letters Patent, is:

1. In a fluid pressure brake, thecombination with 'a brake application valve device having an application cylinder and operated by fluid pressure in said cylinder for efiecting an application of the brakes, of an equalizing valve device having a. slide valve adapted to connect said application cylinder to an application chamber in effecting an application of the brakes, and a pipe direct said application chamber through which fluid is vented. from said chamber to the atmosphere.

2. In a fluid pressure brake, the combination with a brake applicatibn valve device f having an application cylinder and operated by fluid pressure in said cylinder for effecting an application of the brakes, of an egualizing valve device having a slide valve 0. apted to connect said application cylinder to an a plication chamber in effecting an applicaipe directly connected to said chamber, 'an brake valve device having a positionin w ich said pipe is connected to the atmosphere.

3, In a fluid pressure brake, the combination with a brake application valve device havin an application cylinder and operated by fluid ressure in said cylinder for effecting an application of the brakes of an equalizing valve device having a slide valve adapted to connect saida-p lication cylinder to an a plication chamber 1n effecting an application of the brakes, a pipe directly connected to said chamber, and a brake valve device adapted in running position to connect. said pipe to the atmosphere.

4. In a fluid pressure brake, the combination with a brake application valve device having an application cylinder and operated by fluid pressure in said cylinder for efiecting an application of the brakes, of an equalizing valve device having a slide valve adapted to connect said application cylinder to an a plication chamber in efiecting an application of the brakes,-a pipe directly connected to said chamber, an automatic brake valve device, and an independent brake valve device having positions in which said pipe is connected to the atmosphere.

5. In a fluid pressure brake, the combination with a brake application valve device having an application cylinder and o erated an application of the brakes, of an equalizing valve device having a slide valve adapted to connect said application cylinder to an application chamber in effecting an application of the brakes, a pipe directly connected to v said chamber, an automatic brake valve device, and an independent brake valve device, communication through said pipe to the atmosphere being established when said valve devices are in running position.

6. In a fluid pressure brake, the combination with a brake application valve device having an application cylinder and operated by fluid pressure in said cylinder for elfecting an application of the brakes, of an equalizing valve device having a slide valve adapted to connect said application cylinder to an application chamber in effecting an application of the brakes, a pipe directly connected to said chamber, a brake valve device having a running position, and a manually operated cock having a position for connecting said pipe to the atmosphere, communication through said pipe to said cock being controlled by said brake valve device.

7. In a fluid pressure brake, the combination with a brake application valve device having an application cylinder and operated by fluid pressure in said cylinder for effecting an application of the brakes, of an equalizing valve device having a slide valve adapted to connect said application cylinder to an application chamber in effecting an application ofthe brakes, a pipe directly connected to said chamber, a brake valve device having a running position, and a manually operated cock having a position for connecting said pipe to the atmosphere, communication through said pipe to said cock being opened when said brake valve device is in running position.

8. In a fluid pressure brake, the combination with a brake application valve device having an application cylinder and operated by fluid pressure in said cylinder for effecting an application of the brakes, of an equalizing valve device having a slide valve adapted to connect said application cylinder to an application chamber in effecting an application of the brakes, a pipe directly connected to said chamber, a brake valve device having a running position in which said pipe is connected to the atmosphere, and a double heading cock for controlling communication from sa1d pipe through said brake valve device to the atmosphere.

In testimony whereof I have hereunto set my hand.

MABLE M. THOMAS, Ewecutrz'm of the Last Will and Testament of Thomas H. Thomas, Deceased. 

